Holder for carriers of light sensitive emulsions



Nov. 13, 1956 N. KARPF HOLDER FOR CARRIERS OF LIGHT SENSITIVE EMULSIONSFiled April 11, 1952 L- J L 45 Fig. 1

2 Sheets-Sheet l Mlazaas KARI;

N. KARPF Nov. 13, 1956 HOLDER FOR CARRIERS OF LIGHT SENSITIVE EMULSIONS2 Sheets-Sheet 2 Filed April 11, 1952 United States Patent HOLDER FORCARRIERS OF LIGHT SENSITIVE EMULSIONS Nikolaus Karpf, Munich, Germany,assignor to Valentin Linhof, Munich, Germany Application April 11, 1952,Serial No. 281,816

Claims priority, application Germany April 18, 1951 8 Claims. (CI.95-66) The present invention relates to holders for photographic filmplates or similar light-sensitive carriers.

Heretofore known holders of the type to which this invention refers arerather complicated in operation and construction and require great carein order to light-seal light-sensitive emulsion carriers, in particularif such carriers are mounted on glass or like non-flexible plates.

It is, therefore, one of the objects of this invention to provide meansaffording extremely simple construction of the holder housing for anemulsion carrier which may be readily inserted therein and removedtherefrom, said holder being sturdy and may be manufactured atrelatively low cost.

It is another object of the present invention ensuring accurate guidanceand placement of the emulsion carrier in said holder and the closing ofthe latter by means of the dark slide without endangering or subjectingthe light-sensitive carrier, be it in film or plate form, to anysubstantial bending.

It is another object of the present invention to provide meansfacilitating the automatic accessibility to the exposed light-sensitivecarrier upon withdrawal of the dark slide and the ejection of saidcarrier from within said holder therewithout.

Still a further object of the present invention is to provide meansfacilitating the loading and discharge of the holder substantially onopposite sections thereof within a darkroom.

Still another object of the present invention is to provide meansconducive to a compact holder or duplex holder device forlight-sensitive emulsion carriers and to a considerable reduction of thelength of such holder when compared with holders of known constructions.

These and other objects and features will become apparent from thefollowing detailed description, reference being had to the accompanyingdrawing, in which:

Fig. 1 is a front elevational view of a holder made in accordance withthe invention;

Fig. 2 is a side elevational view of the holder of Fig. 1;

Fig. 3 is a fragmentary view of the lower part of the holder of Fig. 1with one of the spring-actuated frame end means swung to a position ofabout 90 with respect to the remainder of the holder, thereby exposingguide means for a film carrier;

Fig. 4 is a side elevational view of the holder part of Fig. 3;

Fig. 5 is a fragmentary view of the upper part of the holder of Fig. 1with parts broken away to expose ejection means for the film carrier;

Fig. 6 is a view similar to that of Fig. 5 with the ejection means shownin a different position for advancing the upper end of thelight-sensitive emulsion carrier; and

Fig. 7 shows on an enlarged scale a vertical section through one of theholder sections of Fig. 2.

Reference is now made to the details of the drawings.

According to Figs. 1 and 2 the double holder consists of the frameshaped housing 1 having the two sec- 2,770,178 Patented Nov. 13, 1956tions 2 and 3. These two sections have the back or partition 4 in common(see Fig. 7). Of the dark slides 5 and 6 only the upper ends withhandles 7 and 8 located at the upper edges of the slides are visible.Each of these handles is equipped with an identification tab 9 at oneside for indicating the number of the respective picture and on thereverse side is equipped with finger gripping means or grooves 10. Theouter part of the frame 11 or 12 of the holder 1 and located adjacentthe slot for insertion of the dark slide carries ribs 12 as well as theerasable identification tabs 13 and 14, which may be used for markingthe date and or the object of the picture. At the end of the holder 1opposite to the side where the dark slide is inserted the hinged hollowframe ends 15 and 16 are located. These hinged frame ends are shaped tocover the slots through which extend the respective emulsion carriers,which frame ends are secured in closed position by'the engagement withthe dark slides 5 and 6 when the latter are inserted in a positionparallel to the partition 41 of the two sections 2 and 3. The hingedframe ends 15 and 16 can be swung to about around the suspension pintles17 and 18 which are disposed at the end walls of sections 2, 3 and at alevel above that of the guides 15a for the insertion of the emulsioncarrier into the respective section.

Figs. 3 and 4 clearly illustrate the way how the hinged frame ends canbe swung. In this case the slide 5 of the holder is partly withdrawn andas a result the hinged frame end 15 has been turned by means of atorsion spring (not illustrated) into the position as indicated in Fig.4. The hinged frame end 16, however, is still located parallel to theback 4 of the one section 2 of the holder housing 1 as its dark slide6not visible in Fig. 4has not been withdrawn in upward direction, thusstill securing the frame end 16 in its closed position.

Fig. 5 illustrates a recess or channel 19 of that part 1 of the onesection of the holder located beside the inserting side of the darkslide. This recess contains an ejection lever 21 for the respectiveemulsion carrier when the latter is inserted in this section, say 3, ofthe holder ejection lever 21 being operable by the handle 20 protrudingthrough a finger-stall at the side of the holder. The ejection lever 21revolves around the pivot 22. In order to obtain a nearly perfect lighttrap the handle 20 of the lever 21 is located in the cavity 23 theborders or edges of which are protected by a stripe of plush andtherefore by means of a light-proof labyrinth system (not shown). Bymeans of the spring 24 the ejection lever 21 is constantly forced backinto its retracted position. The main purpose of the lever is to ejectthe exposed emulsion carrier before the respective section of the holderis reloaded. Moreover it allows to check whether the respective sectionof the holder is loaded or not by means of a slight pressure on handle20. In both cases the ejection lever 21 by means of the handle 20 isadvanced toward the position visible in Fig. 6 and by means of its end25 influences the movement of emulsion carrier 26 located in therespective section of the holder out of the respective open slot uponpositioning of frame end 15 as shown in Fig. 4.

Fig. 7 clearly illustrates that the hinged frame end by means of the endof the dark slide 5 inserted in same is kept safely in its parallelposition to the holder back 4. The insertion side of the dark slide isprovided with a self-locking light trap 27 which consists either of anall around stripe of plush in the inserting zone or of a device whereone side of the inserting Zone is coated with plush and is pressedagainst the other side by spring action. Finally Fig. 7 indicates thatthe emulsion carrier is held by a pressure plate 29 under spring tensionin this section 3 of the holder.

scribed above.

The loading of the respective sections of the holder is performed-whilethe dark slide 5 is in araised position illustrated in Fig. 3 and theinsertion slot being free after the hinged frame end has opened underspring action. After-the dark slide 5-has been again insertedcompletely, the hinged frame end 15' is kept again in its parallelposition to the back 4, which is indicated in Fig. 7. The unloading ofthe holder is performed while the dark slide 5 and the hinged end 15 isin the same position as de- The manipulations of the ejection lever21-by means of the handle pushes the respective emulsion carrier out ofthe section of the holder to such an extent that it can be easily seizedby the fingers of a hand and pulled out entirely.

It is to be remarked that the hinged frame ends 15 and 16- located atthe outer bottom edge of the holder are part of the guide system of theholder. As a result the hinged frame ends will not open while beinginserted into the camera until the respective dark slide is pulledupwardly.

Although one specific embodiment of the invention has been described-andshown in the drawings, it should be noted that the invention may berealized in modified form and adaptations of the arrangements hereindisclosed may be made, as may readily occur to persons skilled in theart without constituting a departure from the spirit and scope of theinvention as defined in the objects and in the appended claims.

Having thus described the invention, what is claimedas new anddesired'to be secured by Letters Patent, is:

1. A holder for light-sensitive carrier means comprising oppositelyarranged frame-shaped housings having end walls, open lower ends and apartition common to said housings, oppositely disposed spring-supportedwalls mounted on opposite faces of said partition, respective dark slidemeans arranged for movement into said housings and spaced from saidspring-supported walls thereof, guide means for the insertion of saidcarrier means into and for their removal from the lower ends of saidhousings, said guide means being disposed to extend within said housingsadjacent said spring-supported walls, respectively, and for cooperationwith the latter, hingedly supported and spring-actuated end frame meansfor closing said lower ends of said housings and shaped for pressingsaid carrier means against said spring-supported walls, when said endframe means close on said housings, said slide means being adapted toengage said end frame means to retain same in closed position on saidhousings,

pivotmeans for each of said end frame means arranged v in recessesdisposed in said end walls of said housings and positioned at a levelabove that of said lower ends of said housings, whereby saidspring-actuated end frame means'upon release from said slide means maybe swung about said pivot means to a position which permits ready accessto said carrier means in said lower ends of said housings,- and ejectormeans operable from without said housings and engageable with therespective carrier means to displace the later toward and beyond therespective lower housingv end.

2. A holder according to claim 1, wherein said springsupported walls areprovided with respective channel, said ejector means extending from saidend walls of said housings thereinto, respectively, and being pivotedfor shifting said carrier means with respect to the lower ends of saidhousings in order to readily pull said carrier means out of said lowerends of said housings, said ejector means being accommodated in saidchannels.

3. A holder for carrier means of light-sensitive emulsion comprising aframe-shaped housing having a closable lower end and opposite end wallsprovided with recesses, a dark slide engageable with said housing andforming one side wall of said housing, a spring-supported wall formingthe opposite side wall of said housing, guide means for said carriermeans positioned within said housing and extending from said lowerendbetween said spring-supported wall and said dark slide when thelatter is inserted in said housing, end frame means supported forswinging movement in said recesses of said end walls of saidframe-shaped housing, said end frame means being shaped for engagementwith a portion of said dark slide to thereby hold said end frame meansin position when closing said lower end of said housing, whereby saidendframe means maintain said carrier means against said spring-supportedwall when said carrier is slid along said guide means into said housing,and spring means operatively connected with said end frame means forautomatically swinging the later to a position of approximately withrespect to the remainder of said frame-shaped housing upon withdrawal ofsaid portion of said dark slide from the engagement with said end framemeans, whereby said carrier means is made accessible for insertion intoor withdrawal from the frame-shaped housing along said guide means.

4. A holder for carrier means of light-sensitive emulsion comprising aframe-shaped housing having a closable lower end and opposite end walls,each of said end walls being provided with a recess adjacent said lowerend of said housing, a dark slide engageable with said housing, guidemeans for said carrier means extending from said lower end of saidhousing thereinto, end frame means arranged for swinging movement aboutsaid opposite end walls of said frame-shaped housing and supported insaid recesses thereof, said end frame means being shaped for engagementwith a portion of said dark slide to hold said end frame means in closedposition on said lower end of said housing, and means springedlyconnecting said end frame means with said housing for automaticallyopening the lower end of said housing by swingingto a positionapproximately 90 with respect to the remainder of said frame-shapedhousing upon withdrawal of said portion of said dark slide from theengagement with said end frame means, so that said carrier meansisautomatically made accessible for loading or discharging along saidguide means.

5. A holder for light-sensitive carrier means comprising oppositelyarranged frame-shaped housing sections each having end walls, closablelower ends and a partition common to said housing sections,spring-supported walls mounted on opposite faces of said partition,respective dark slide mean arranged for movement into said housingsections, guide means for the insertion of said carrier means into andfor their removal from said lower ends of said housings, said guidemeans be-v ing disposed to extend into said housing sections andadjacent said spring-supported walls, respectively, springactuated endframe means for closing said lower ends of said housing sections andshaped for locking said guide means when said end frame means close onsaid housing sections, said slide means being adapted to engagerespective portions of said end frame means to retain the latter inclosed position on said housing sections, pivot means arranged inrecesses disposed in said end walls of said housing sections andindependently and swingably supporting said end frame means, wherebysaid spring-actuated end frame means upon release from said slide meansare swung about. said pivot means to a posi tion of about 90 withrespect to said guide means to permit ready access to said carrier meansin said lower ends of said housing sections, and means for ejecting;

said carrier mean from said lower ends of said housing sections andaccommodated in channels provided in said spring-supported walls.

6. A holder for a camera and for receiving a carrier of light-sensitiveemulsion; comprising a dark slide which.

is inserted through a slot at one end of the holder, the opposite end ofthe holder being provided with a slot through which the emulsion carrieris inserted, a hinged closure end which is held in its closed positionby the darkslide when the latter is fully inserted in the holder,

said hingedclosure end being spring-loaded so that it.

opens automatically when the dark slide is withdrawn and out ofengagement with said closure end, and a lever for ejecting the emulsioncarrier, said lever being pivoted and operable by a handle protrudingfrom the side of the holder and being disposed in a recess adjacent theslot through which the dark slide is interta-ble.

7. A holder according to claim 6, in which said recess is providedadjacent the pivot of said lever and communicates with a groove coveredwith plush, so as to 'form a light trap.

8. In a holder having opposite open ends and for carryinglight-sensitized means; the combination with a dark slide insertablefrom one end of said holder, of means swingably supported at the otherend of said holder and constructed to engage a portion of said darkslide for retaining said swingalble means in one position, in which saidother end of said holder is closed, said dark slide when disengaged fromsaid swingable means opens said other end of said holder for withdrawalof said light-sensitized means from said holder, and ejector meansprovided with a handle and positioned at said one holder end to actuatesaid ejector means for abutment against said light-sensitized meansthereby displacing same toward said other end of said holder uponremoval of said dark lide.

References Cited in the file of this patent UNITED STATES PATENTS531,012 Thornton Dec. 18, 1904 1,711,444 Bornma-nn Apr. 30, 19291,933,823 N-agel Nov. 7, 1933 2,114,638 Parker Apr. 19, 1938 2,339,658Smith Jan. 18, 1944 2,410,919 Aiken Nov. 12, 1946 2,433,613 Little Dec.30, 1947 2,462,713 Bilofsky Feb. 22, 1949

